How to I get light to not affect the rest of the scene
This is - as far as i know - not really possible at the moment. The feature is called &quot;light linking&quot; https://developer.blender.org/T68915

In Eevee you could try to work with light -&gt; custom distance

Or work with layers, meaning to seperate your renders per object/ fore-/background and combining them again in the compositor.